Environmental Impact Study of an Offshore Wind Farm

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Offshore wind farms are presented as a key technology in the European Union. The installed capacity is expected to increase from 12 GW today to 60 GW in 2030. Onshore wind energy is already part of our daily lives, despite Environmental Impact Studies of Offshore Wind Farms they are not as common in Spain, where offshore wind farms have barely been built, with the exception of cases such as the Elisa project in Greenalia in the Canary Islands of 50 MW.

Offshore wind energy is, therefore, a renewable alternative with high potential and that (perhaps) is here to stay. That is why for some time now we have been specializing most of our technicians in marine environmental inventories and in the preparation of Environmental Impact Studies of Offshore Wind Farms. Below we summarize new environmental impacts that offshore wind energy can produce, in addition to those already commonly evaluated for the construction and operation of wind energy in general, in the design, construction and operation phases during its useful life.

Affection to the seabed

Depending on the technology to be used (floating wind energy or fixed foundation wind energy), if excavations are necessary, these may cause sediment to rise throughout the water column and, therefore, significant damage to benthic communities. To this it is necessary to add the actual condition on the background that will cause the installation of the wind turbine platform if this type of structure is used. In the case of floating wind power, the impacts are very small in this regard.

Conditions affecting marine waters

An Environmental Impact Study of an Offshore Wind Farm cannot ignore the effects that may occur on the waters. Both during the construction and operation phase of an offshore wind farm, the impact on water is potential due to possible discharges of fuel or oil from vessels, as well as from the machinery used. During the operating phase, contamination may be caused by possible discharges from the wind turbine due to a breakdown or maintenance and repairs to them.

Noise and vibrations in the environmental impact studies of offshore wind farms

In the operating phase of the offshore wind farm, the vibrations of the wind turbine tower may cause significant vibrations underwater as it has a large contact surface with the water, which will also cause a transmission of noise to the bottom.

Electromagnetic radiation

The presence of power lines on the seabed generates electromagnetic fields that can affect species of marine fauna and the navigation systems of ships.

An Environmental Impact Study of an Offshore Wind Farm is approached very differently from onshore wind and has important limiting factors.

Alteration of marine currents

The installation of wind turbines may cause variations in marine currents due to material dragging, installation of new structures to act as brakes, etc. This requires us to model marine currents to study the impact of the park on them.

Impacts on fauna in the environmental impact studies of offshore wind farms

Although this is an environmental impact common to terrestrial wind energy, these impacts deserve a separate chapter that we will address in subsequent posts, where we will explain the main impacts and the species potentially affected.

Learn more about offshore wind farms

For more information, we leave you two links:

• SEO/BirdLife explains its position in front of this type of installation:

Marine Renewable Energies

• The second, of Offshore Wind Forum which explains the reasons for advancing this type of energy. Download his Manifesto here.

If you need information or want to undertake an Environmental Impact Study of an Offshore Wind Farm, do not hesitate to contact contact Ideas MedioAmbiental.

Environmental impact study of an offshore wind farm

Offshore wind farms are revealed as a key technology in the European Union. Installed power is expected to increase from the current 12 GW to 60 GW by 2030. Onshore wind energy (onshore) is already part of our daily basis; however Environmental Impact Studies of Offshore Wind Farms are still not widespread in Spain. In our country, hardly any offshore wind farms have been developed, with the exception of the 50 MW Elisa Project located in the Canary Islands, established by the company Greenalia.

Offshore wind energy is a renewable alternative with strong potential and one that might be here to stay. Therefore, in Environmental Ideas, we are investing time in specializing a part of our technicians in marine environmental inventories and Environmental Impact Studies focused on offshore wind farms.

This article summarises recent environmental impacts found associated with offshore wind energy installations. Some of them are already considered for the design, construction and operation phases of onshore wind farms.

Effects on the Seabed

Depending on the technology employed, wind farms with fixed foundations may require excavation works and installation of turbine platforms, which could cause disruption of the seabed and uplift of sediments throughout the water column. These could lead to significant effects on Benthic communities. In the case of wind farms with floating foundations, these impacts are highly reduced.

Effects on Marine Waters

An Environmental Impact Study of an Offshore Wind Farm must consider the effects on marine waters. Both during the construction and operation phases of an offshore wind farm, the impacts of potential fuel or oil spills from the vessels and machinery should be taken into account. During the operation phase, occasional contamination can occur due to discharges from the wind turbine associated with malfunction, maintenance and repairing works.

Noise and Vibrations in Environmental Impact Studies of Offshore Wind Farms

In the operation phase of an offshore wind farm, due to the large surface in contact with the water, the vibrations of the wind turbine tower may cause significant underwater vibrations and also affect the seabed.

An Environmental Impact Study of an Offshore Wind Farm is approached very differently from Onshore Wind Farms and presents important limiting factors.

Electromagnetic radiation

The presence of power lines on the seabed generates electromagnetic fields that can impact marine fauna species and ship navigation systems.

Alteration of Sea Currents

Wind turbines installations may cause changes in sea currents due to dragging of materials, act as barriers, etc. Therefore, it is necessary to study the specific implications of the wind farm in the environment by modelling marine currents.

Environmental Impact Studies of Offshore Wind Farms: Impacts on fauna

Although it is a well-known environmental impact associated with onshore wind energy, these impacts deserve a separate chapter and will be addressed in subsequent posts. We will explain in detail the main impacts and the species potentially affected.

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More information on offshore wind farms

For more information check these two links:

• SEO/BirdLife explains its position in front of this type of installation:

Marine Renewable Energies

• The second, from Offshore Wind Foro (in Spanish), presents reasons to develop this type of energy Download your Manifesto here.

If you need more information or want to address an Environmental Impact Study of an Offshore Wind Farm, do not hesitate to contact Environmental Ideas.